Fetch content from an external link

I’ve never used this plugin, so I can’t really vouch for it but it may be of some help.

https://wordpress.org/plugins/fetchurl/

I don’t believe it will do exactly what you’re wanting, although it might be a place to start. I’m assuming you’re wanting similar functionality to that of Facebook and other sites when sharing a link. I don’t know of any plugins that replicate that, but someone on the forums might.

Good luck and I hope it helps!